Signaling apparatus



APPi1 1940. J. A. HASSAN 2.l98,1l2

- smmum; APPARATUS Filed Jan. 6, 1938 2 Sheets-Sheet 1 VOICE Con. OF Louo SPEAKER 1770677507" 4 dyad m5, Q4

P 23, J. A. HASSAN 8.

SIGNALING APPARATUS v Filed Jan. a, less 2 Sheets-Sheet? llllh /I 5 @AQWMW dfforv cy Patented Apr. 23, 1940 UNITED STATES PATENT OFFICE SIGNALING APPARATUS Application January 6,

3 Claims.

This invention relates to electrical signaling apparatus, and is especially adapted to signal persons who are beyond hearing distance of the usual voice-transmitted radio message.

The principal purpose of my invention is to provide electrical apparatus which is selectively responsive to relatively low audio frequency oscillations emanating from a radio receiving set or other source of amplified audio frequencies and which causes automatic and sustained actuation of a signal when energized by such low frequency currents. More specifically, the invention contemplates the provision of a vibratory relay which is energized by audio frequency currents, and an electric circuit from said relay to a current source for the signal, said circuit comprising adjustable vibratory contacts for transmitting only extremely low audio frequencies and a time relay for holding the signal in operation while such low frequencies are being transmitted to the current circuit of the signal.

Another object is to construct said apparatus so that its parts are simple and inexpensive to manufacture and assemble, and to provide such a simple and efficient manner of operation of said apparatus that it can be relied upon to function practically perfect over a long period of frequent use.

The foregoing and other objects which will appear as the nature of the invention is better understood, may be accomplished by a construction, combination and operative arrangement of parts such as is disclosed by the drawings and specification. The nature of the invention is such as to render it susceptible to various changes and modifications, and, therefore, I am not to be limited to said disclosure; but am entitled to all such changes therefrom as fall within the scope of my claims.

In the drawings:

Figure 1 is a front 'elevational view of my apparatus in diagrammatic form.

Figure 2 is a diagrammatic view of the electric circuits and devices of my apparatus.

As illustrated, the apparatus comprises a radio receiving set R of any well known and suitable make for long or short waves, havingawell known type of audio frequency output transformer I2. A wire l3 extends from said transformer l2 to a switch [6 and another wire l5 extends to a voice coil i4 customarily used in radios. The electrical circuit for the radio receiver R usually established through the said voice coil ll may be opened by manual movement of said movable 1938, Serial No. 183,673

switch I6 installed at a point between wiring I3 and I5. Another wire I! extends from said switch [6 to a coil 20, which constitutes a vibratory relay responsive to the audio frequency currents in the output circuit of the radio receiver 5 and another wire l8 extends from said coil to said transformer l2. Said switch It is shown in a neutral position in Figure l of the drawings, and in an automobile it ordinarily would be mounted on the" dash board. The usual radio circuit through said voice coil l4 would ordinarily be kept closed by said switch when the operator is in said auto; but said circuit would be thrown open when the operator steps out of the auto.

Said switch it is adapted to be moved so that it will establish a circuit to the vibratory relay 20 and thence through my signaling apparatus instead of to said voice coil l4, and thereby illuminate a signal light when a signal is broadcasted from headquarters.

It is desirable that my signaling apparatus respond to sound waves of a different frequency than those ordinarily caused by the human voice, and they preferably should be of lower frequency. I have found that sound waves such as are caused by an ordinary automobile horn or a buzzer are suitable to actuate my signaling apparatus. For this purpose I provide the vibratory relay 20 capable of mechanical movement when actuated by impulses from sound waves. It has a spider 2| and a coiled retainer spring 22, as shown. The ordinary voice coil for a loud speaker, but without the cone, will serve as said coil 20, or any device that sufiiciently moves when electrical impulses resulting from sound waves, preferably of low frequency, strike it. Said coil 20 has a magnetic field 24, one of the permanent magnetic type being desirable, so that wires establishing a circuit from said coil 20 to a battery B or other source of electrical power may be dispensed with. Resting on said coil 20, or so positioned as to be immediately responsive to any movement of said coil 20, is a lever L, pivotally connected as at 25 to a support 25a, which lever consists of a main bar 26 having an extension member 21 at the front thereof, on the end of which is a contact point 28 which normally is lower than and spaced from another contact point 29 stationarily mounted opposite thereto. At the rear of said bar 26 is another extension member 3| which serves as counterbalancing means. Both said extension members 21 and 3| are preferably made of spring steel naling circuit associated with said transformer and relay, and a manually operable, double-contact switch selectively operative to close either of said circuits respectively for operating the transmitting circuit or the signaling circuit, the signaling circuit also comprising a signal and a circuit therefor including a current source and a switch, a time relay and a circuit therefor including a current source and a pair of normally spaced contacts disposed in operative relation to said vibratory relay, one of said contacts being movable and being engaged by the movable core of the vibratory relay during energization thereof and said contacts being so spaced that they are closed only by extreme movement of said core in response to relatively low audio frequencies thereby to actuate the time relay, and said switch being operatively connected to the movable core of the time relay so that the switch is closed while said relay is energized, thereby to actuate the signal.

2. Electrical signaling apparatus, comprising a radio receiver, an output transformer associated therewith for producing amplified audio frequency oscillations, a voice coil, a transmitting circuit including the transformer and Voice coil, a vibratory relay having a movable core, a signaling circuit associated with said transformer and relay, and a manually operable, double-contact switch selectively operative to close either of said circuits respectively for operating the transmitting circuit or the signaling circuit, the signaling circuit also comprising a signal and a circuit therefor including a current source and a switch, a time relay and a circuit therefor including a current source and a pair of normally spaced contacts disposed in operative relation to said vibratory relay, a pivoted lever carrying one of said contacts and disposed in the path of movement of the core of the vibratory relay so that the contact on the lever is moved toward the other contact when said relay is energized, a spring connected to the lever and tending to hold said contacts apart, said contacts being so spaced that they are closed only by such movement of said core as is suflicient to overcome the resistance of said spring and as is caused by relatively low audio frequencies, thereby to energize the time relay, and said signal switch being operatively connected to a movable element of the time relay so that the switch is closed and held closed while said relay is energized, thereby to actuate the signal.

3. Electrical signaling apparatus, comprising a radio receiver, an output transformer associated therewith for producing amplified audio frequency oscillations, a voice coil, a vibratory relay having a movable core, a signaling circuit associated with said transformer and relay, and a manually operable, double-contact switch selectively operative to close either of said circuits respectively for operating the transmitting circuit or the signaling circuit, the signaling circuit also comprising a signal and a circuit therefor including a current source and a pair of normally spaced contacts disposed in operative relationship to said relay, one of said contacts being movable and being engaged by the movable core of the relay during energization thereof, and said contacts being so spaced that they are closed only by extreme movement of said core in response to relatively low audio frequencies, there-' by to actuate the signal.

JOSEPH A. HASSAN. 

